[tooltip] Fix provider delay group lifecycle

[michaldudak]

Summary

• Keep FloatingDelayGroup's initial delay ref synced with Tooltip.Provider prop updates.
• Preserve the active delay-group context when an inactive consumer unmounts.
• Add regression coverage for updated closeDelay and inactive cleanup.

Bug

FloatingDelayGroup captures the initial delay only once, so later Tooltip.Provider closeDelay updates are ignored. Its cleanup also clears the shared current context for any consumer unmount, meaning an inactive tooltip unmount can prevent the next tooltip from closing the active one.

Reproduction

• Before: https://codesandbox.io/s/9qrjp6?file=/src/App.tsx
• After: https://codesandbox.io/s/sc77tm?file=/src/App.tsx

Test plan

• pnpm test:jsdom FloatingDelayGroup --no-watch
• pnpm test:jsdom TooltipProvider --no-watch
• pnpm test:chromium TooltipProvider --no-watch
• pnpm eslint
• pnpm typescript

[pkg-pr-new]

• base-ui-tanstack-start

• vite-css-base-ui-example

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/react@4887
  

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/utils@4887
  

commit: c747e4d

[code-infra-dashboard]

Bundle size

Bundle	Parsed size	Gzip size
@base-ui/react	🔺+220B(+0.05%)	🔺+81B(+0.05%)

Details of bundle changes

Performance

Total duration: 1,339.59 ms -52.06 ms^(-3.7%) | Renders: 50 ⁽⁺⁰⁾ | Paint: 2,053.74 ms -75.32 ms^(-3.5%)

Test	Duration	Renders
Select open (500 options)	58.62 ms 🔺+12.35 ms(+26.7%)	14 (+0)

11 tests within noise — details

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[michaldudak]

Codex Review (GPT-5.5)

Dominant type: bug-fix, with regression-test coverage. I reviewed the full PR diff against freshly fetched upstream/master; the lifecycle fix is narrow and matches the Tooltip delay-group failure modes it targets.

1. Bugs / Issues (None)

No actionable issues found.

Root Cause & Patch Assessment

The patch addresses the two relevant root causes: inactive consumers no longer clear the active delay-group context on unmount, and provider delay changes now refresh the backing refs without breaking the current instant-open phase. The cleanup now keys off the active floatingId, and active unmounts reset the id, context, delay ref, and pending timeout together.

Test Coverage Assessment

Coverage is well targeted. The new FloatingDelayGroup test fails on upstream/master when only the test change is applied, and passes on this branch. The new Tooltip.Provider close-delay update test also fails on upstream/master and passes on this branch.

Validated:

• pnpm test:jsdom FloatingDelayGroup --no-watch
• pnpm test:jsdom TooltipProvider --no-watch
• pnpm exec eslint packages/react/src/floating-ui-react/components/FloatingDelayGroup.tsx packages/react/src/floating-ui-react/components/FloatingDelayGroup.test.tsx packages/react/src/tooltip/provider/TooltipProvider.test.tsx --max-warnings 0 --report-unused-disable-directives

Recommendation

Approve ✅

The change is small, focused, and has regression tests that demonstrate the previous behavior was broken against the fresh base branch.